Glucocorticoids and the renal Na-H antiporter: role in respiratory acidosis
| Autor: | Liping Wang, Peyman Pahlavan, Jose A.L. Arruda, O.S. Ruiz |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
medicine.medical_specialty
Sodium-Hydrogen Exchangers Brush border Hydrocortisone Physiology Antiporter Clinical Biochemistry Biochemistry Amiloride Kidney Tubules Proximal Cellular and Molecular Neuroscience Endocrinology Internal medicine medicine Animals Glucocorticoids Dexamethasone Cells Cultured Kidney Chemistry Respiratory disease medicine.disease Adaptation Physiological Respiratory acidosis medicine.anatomical_structure Acidosis Respiratory Rabbits Glucocorticoid medicine.drug |
| Zdroj: | Regulatory peptides. 48(3) |
| ISSN: | 0167-0115 |
| Popis: | We examined the role of glucocorticoids in the activity of the renal brush border Na-H antiporter under baseline conditions (5% CO2 gassing) and during respiratory acidosis (10% CO2 gassing) in cultured monolayers of a proximal tubule suspension (primary cultures of the proximal tubule). Primary cultures of the proximal tubule showed an adaptive increase in renal brush border Na-H antiporter activity in response to respiratory acidosis in presence but not in the absence of physiologic concentrations of hydrocortisone in the medium. The effect of hydrocortisone to increase the activity of the renal brush border Na-H antiporter in respiratory acidosis could also be elicited by dexamethasone. Deletion of hydrocortisone from the medium also impaired the baseline activity of the Na-H antiporter. The effect of hydrocortisone to increase the activity of the Na-H antiporter under baseline conditions and during respiratory acidosis was elicited by physiologic concentrations of the hormone and 100-fold increase in concentration did not further increase the activity of the Na-H antiporter. These results demonstrate that the presence of physiologic concentrations of glucocorticoids are necessary for the baseline activity of the renal brush border Na-H antiporter and its adaptive increase in response to respiratory acidosis. |
| Databáze: | OpenAIRE |
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